<template>
  <div>
    <div v-for="(val, index) in arr" :key="index" style="display: inline-block">
      <input type="checkbox" v-model="list" :value="val" />&nbsp;
      <span>{{ val }}</span> &nbsp;
    </div>
    <p>你选中的元素,累加的值和为:{{ count }}</p>
  </div>
</template>

<script>
export default {
  data() {
    return {
      arr: [9, 15, 19, 25, 29, 31, 48, 57, 62, 79, 87],
      list: [],
    };
  },
  computed: {
    count() {
      return this.list.reduce((sum, val) => (sum += val), 0);
    },
  },
};
</script>

<style>
</style>